Enable Ubuntu 19.04 Server to start over LAN (Wake-on-LAN)
History
I decided to suspend the file server during the daytime on weekdays to save electricity, so I have to manually cancel the suspend on a public holiday weekday. This itself is unavoidable, but at least, I want to be able to turn on remotely via LAN from the main machine rather than the power button . So I try the fanction called Wake-on-LAN.
Procedure (server side)
Setting UEFI
Reboot to enter the UEFI screen and set the boot over the LAN.
Depending on the motherboard, In my case, I switch Power On By PCI-E/PCI to enabled.
As an aside, there was also an item named Power On By RTC(faint memory). I think I probably need to enable this if I want to shut down and boot instead of suspending in rtcwake.
Install Ethtool
sudo apt install ethtool
Check the LAN used by Wake-on-LAN
$ ls/sys/class/net/
enp3s0 lo wlp4s0
In this case enp3s0 seems to be wired LAN,I use this. wlp4s0 is maybe wifi.
Wake-on-LAN Settings
Enable with the following command:
$ sudo ethtool -s enp3s0 wol g
Check the settings.
$ sudo ethtool enp3s0
Settings for enp3s0:
Supported ports: [ TP ]
Supported link modes 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supported pause frame use: Symmetric
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised pause frame use: Symmetric
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Speed: 1000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
MDI-X: off (auto)
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x0000007 (7)
drv probe link
Link detected: yes
Check mac address
Before use Wake-on-LAN, I needs to know the MAC address that is specific ID of device that connecting to the LAN, so let’s check.
$ ip addr
(ommission)
2: enp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP>mtu 1500 qdisc mq state UP group default qlen 1000</BROADCAST,MULTICAST,UP,LOWER_UP>
link/ether 04:92:26:00:00:00 brd ff:ff:ff:ff:ff:ff:ff:ff
(ommitssion)
In this case 04:92:26:00:00:00:00 will be the target MAC address. (Because the referring source had conceal the MAC address, So follow that, this MAC address is canged from the actual MAC address .)
The server side works is end, so shut down.
Procedure (client side)
From here, I start the main PC side settings to run Wake-on-LAN.
Wake-on-LAN Installation
It’s in the official repository of Ubuntu so you can install it normally with apt install
$ sudo apt install wakeonlan
Running Wake-on-LAN
Execute wakeonlan with MAC address.
$ wakeonlan 04:92:26:00:00:00
Sending magic packet to 255.255.255.255:9 with 04:92:26:da:61:3c
I was able to confirm the boot safely.
Referred by
UbuntuでWakeOnLanを使って離れた場所にあるPCを起動する方法【裏技あり】
Linux から認識されている、すべてのネットワークインターフェイス名だけを取得する
Ubuntuのinterfacesについて。